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From aaron morton <aa...@thelastpickle.com>
Subject Re: Active / Active Data Center and RF
Date Sun, 20 Mar 2011 22:56:27 GMT
The API provides for Quourm CL to be used either across all replicas (ignoring DC's), the local
DC or each DC. See Consistency level here http://wiki.apache.org/cassandra/API

Hope that helps
Aaron

On 19 Mar 2011, at 06:54, mcasandra wrote:

> When in active/active data center how to decide right replication factor?
> Client may connect and request for the information from either data center
> so if locally it's RF=3 then in multiple data center should it be RF=6 in
> active/active?
> 
> Or what happens if it's RF=3 with network toplogy and 2 copies are stored in
> Site A and 1 copy in Site B data center. Now client for some reason is
> directed to Site B data center and does a write, now would Site B have 2
> copies and Site A one (or still 2)? It's getting confusing slowly :) I have
> several more questions but will start with understanding this first. 
> 
> --
> View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Active-Active-Data-Center-and-RF-tp6185528p6185528.html
> Sent from the cassandra-user@incubator.apache.org mailing list archive at Nabble.com.


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